What's the 2001 BMW 525i vehicle speed sensor location?

The 2001 BMW 525i has a small number of speed sensors, so depending on which You're referring to, You'll find them in different locations. The wheel speed sensors are located in each wheel hub. More than likely, You're referring to the transmission speed sensor. This is the one whose failure will affect Your speedometer and odometer -- these are pretty important "safety features" that You'll want to keep working! First of all, the manual transmission models didn't have a transmission speed sensor, so this is only applicable to automatic models. You'll find the TSS mounted in the tail shaft of the transmission, so it should be relatively easy to access. If You get under the car and look to the rear side of the transmission, You'll likely be able to see it.